Hi Ronald & utrace developers....
I am back...
I am upgrading my kmview support and I have stepped into a clear bug.
in utrace_reap:
----------
list_for_each_entry_safe(engine, next, &utrace->attached, entry) {
ops = engine->ops;
engine->ops = NULL;
engine->flags = 0;
list_move(&engine->entry, &detached);
/*
* If it didn't need a callback, we don't need to drop
* the lock. Now nothing else refers to this engine.
*/
if (!(engine->flags & UTRACE_EVENT(REAP)))
continue;
------------
The code following this 'if' is never executed (i.e. the reap callback never
called).
In fact it is impossible for (engine->flags & UTRACE_EVENT(REAP)) to be
true given that a few statement above engine->flags has been set to 0!
To fix the bug:
clean all the events but reap:
engine->flags &= UTRACE_EVENT(REAP);
or save the flag in a temporary var before cleaning it, as you do for
engine->ops.
ciao
renzo
